My coworker bought one (the slim) after trying my OB2, and he seems to really like it. The nice part is that they have all of the rings that Lucasi puts on their cues, so you have more options.
My coworker says it plays just like my OB2, and it seems to have improved his game as much as the OB2 did for me.
If you are looking for a LD shaft, I'd recommend it.